Specification 274c
Amendment 1
February 2001
UNITED STATES DEPARTMENT OF AGRICULTURE
FOREST SERVICE
SPECIFICATION FOR
PUMP, LIGHTWEIGHT, PORTABLE
Page 3
3.2.1. Engine.
Add the following sentence:
The fuel system, to include all components beginning at the fuel tank to and including the
carburetor, shall not leak when a full fuel can is positioned above the pump at a vertical height equal
to the length of the fuel line.
Page 12
4.7.4.1. Suction Lift.
Replace the first sentence with the following:
All pump testing shall be conducted at a 5 foot (1.52 m) +/- 3 inches (76 mm) suction lift.
Page 12
4.7.4.4. 100-Hour Endurance Performance Test.
Replace the fourth sentence with the following:
For example, multiply the square root of 0.85 with each value of the corrected curve
( p2 = [ p1 x (square root of 0.85) ]; f2 = [ f1 x (square root of 0.85)].